Malignant tumors may develop in any part of the body. - Malignant (or cancerous). In malignant tumors, cancer cells invade and destroy the cells that are nearby. (The cells of malignant tumors proliferate uncontrolled <span>way).</span></span>
If a person's immune system attacks the thyroid gland, it may react by producing extra hormones. The autoimmune antibodies can attack the muscles and soft tissue surrounding the eyes, which can cause them to protrude from the sockets. This can lead to: dry or gritty eyes.